ci: Fix nightly to a version where rustfmt is available
rustfmt has gone unavailable on nightly again. Fix the compiler to
a version which rustfmt can be downloaded for.
ci: Get rid of matrix build
Instead of a matrix build just build a single time
with all features enabled.
Signed-off-by: Rahix <rahix@rahix.de>
ci: Fix nightly to 2020-07-12
Fix nightly to a version where rustfmt was still available.
Signed-off-by: Rahix <rahix@rahix.de>
ci: Attempt building multple chips at once as well
Signed-off-by: Rahix <rahix@rahix.de>